Who knows what the future holds. Not just Iran, this whole ISIS/ISIL thing could turn nasty for Israel too.
Not to steal the thread topic but boy what a waste the whole Iraq war was if we let it fall to a militia. We could have divided Iraq, or just killed Saddam and let the militias fight it out before without risking so many American soldiers. Instead we tried to reform the country, left way too early, and look what happened. We needed decades to reform Europe and Japan after WW2, why would we think Iraq would reform in 25% the time?
And in retrospect it should have been predictable because the EXACT same thing happened with the so-called Palestinian Authority. Israel propped up the PLO and Arafat and put them in charge of West Bank (when Arafat in fact may have never in his life stepped foot in that land before Israel put him there) and within a few years Hamas became more powerful and eventually overthrew the PA. Funny we expect Israel to trust that this plan will work when it failed several times already. Israel can’t trust a negotiated deal with the PA - it needs Hamas to deal, which they say they wont - and for security reasons it cannot withdraw from the territory unilaterally. Tough spot. Maybe they can encircle it - take back the Philadelphi corridor (and/or flood it, to destroy the tunnels) and the Jordan Valley strip to control the borders and let the Palestinians manage their affairs. But as long as the are attacked they will need to occupy and/or fight back.